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Oktoberfest Challenge!

PrimeGrid - St, 18.09.2019 - 14:18
From September 21st, 2019 Primegrid will be running an AP27 Challenge to celebrate Oktoberfest! The world's biggest Volkfest is held annually in Munich, Bavaria, Germany, with more than six million people from around the world attending. The Challenge starts at 11:00 UTC and ends 5 days later on 26th September at 11:00 UTC. Work units from the AP27 project, which are downloaded and completed during the challenge will count towards your challenge score. The last AP26 was found on 17th November 2018. Can we find an AP27 during the Challenge? For more information and discussion, please head over to the official challenge thread: http://www.primegrid.com/forum_thread.php?id=8764 Good luck!
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Rosetta Android Beta version 4.11 released for testing

RALPH@home - Ut, 17.09.2019 - 01:19
The rosetta_android_beta application has been updated to version 4.11. This version uses the latest Rosetta source. Please post issues/bugs regarding this app version in this thread
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Help Cure Muscular Dystrophy Researcher Developing New Methods for Deciphering Protein-Protein Interactions

World Community Grid - Št, 12.09.2019 - 19:47
Dr. Alessandra Carbone, the primary investigator for the Help Cure Muscular Dystrophy project, recently published a paper along with several colleagues to propose new techniques for looking at the complexities of protein-protein interactions.
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World Maths Day Challenge

PrimeGrid - Št, 12.09.2019 - 13:52
Announcing a new Challenge slot! To celebrate World Maths Day, and our new PPS-DIV sub-project, we'll be running a 5 day Challenge from 10th October 18:00 UTC until 15th October 18:00 UTC. Other Challenge dates are unaffected. The Fermat Divisor search is especially designed to have a better chance of finding a Fermat Divisor. It has a limited number of candidates to check, and once they're gone, the project is over. A new Fermat Prime Divisor earns the finder a rare badge. The project has found 18 primes so far, but no divisor. For more information and discussion, read this forum thread or join our Discord server.
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World Record Generalized Cullen Prime

PrimeGrid - St, 11.09.2019 - 14:54
On 2 September 2019, 03:39:59 UTC, PrimeGrid’s Generalized Cullen/Woodall Prime Search found the largest known Generalized Cullen prime: 2805222*252805222+1 Generalized Cullen numbers are of the form: n*bn+1. Generalized Cullen numbers that are prime are called Generalized Cullen primes. For more information, please see “Cullen prime” in The Prime Glossary. The prime is 3,921,539 digits long and enters Chris Caldwell's The Largest Known Primes Database ranked 1st for Generalized Cullen primes and 21st overall. Base 25 was one of 11 primeless Generalized Cullen bases for b ≤121 that PrimeGrid is searching. The remaining bases are 13, 29, 47, 49, 55, 69, 73, 101, 109 & 121. The discovery was made by Tom Greer (tng*) of the United States using an Intel(R) Core(TM) i9-9900X CPU @ 3.50GHz with 32GB RAM, running Microsoft Windows 10 Professional x64 Edition. His computer took 3 hours and 23 minutes to complete the primality test using multithreaded LLR. Tom is a member of the Sicituradastra team. The prime was verified on 3 September 2019 05:15:11 UTC by Tim Terry (TimT) of the United States using an Intel(R) Core(TM) i7-7700K CPU @ 4.20GHz with 16GB RAM, running Microsoft Windows 10 Professional x64 Edition. This computer took about 24 hours 11 minutes to complete the primality test using multithreaded LLR. Tim is a member of the Aggie The Pew team. For more details, please see the official announcement.
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UPDATE: NO Scheduled Downtime Thursday 9/12/19 Evening

Milkyway@Home - Po, 09.09.2019 - 18:22
Hi everyone,

The Milkyway server will be down this Thursday, 9/12/2019 starting at 4PM. The server should be back up by midnight. You will not be able to download or return workunits during this time, and the website will also be down. Any issues/questions can be directed at our email milkyway@cs.rpi.edu while the server is down.

- Tom
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New Project: Fermat Divisor Search

PrimeGrid - So, 07.09.2019 - 00:18
PrimeGrid is proud to announce that we have a new sub-project, the Fermat Divisor search. This is a variant of our other PPS (Proth Prime Search) sub-projects and is specially designed to have a better chance of finding a Fermat Divisor. Unlike most of our other sub-projects, this one will not run forever. It has a limited number of candidates to check, and once they're gone, the project is over. My best guess is that this project will last about three months. It uses the same badge and stats as the other PPS sub-projects, so there's no new badge. But this is probably the best chance of discovering a Fermat divisor and earning that rare badge. For more information and discussion, read this forum thread or join our Discord server.
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More Acemd3 tests

GPUGRID - Pi, 06.09.2019 - 14:23
We've uploaded Windows and Linux apps named "acemd3". If thing go as expected, they should be the new simulation engine. They should be an improvement on many aspects, especially maintainability and compatibility with RTX. There were a few short test workunits (TONI_TEST). Larger one should come soon. Please be patient as we iron out the details.
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Thanks for supporting SixTrack at LHC@Home and updates

LHC@home - Ut, 23.01.2018 - 19:08
Dear volunteers,

All members of the SixTrack team would like to thank each of you for supporting our project at LHC@Home. The last weeks saw a significant increase in work load, and your constant help did not pause even during the Christmas holidays, which is something that we really appreciate!

As you know, we are interested in simulating the dynamics of the beam in ultra-relativistic storage rings, like the LHC. As in other fields of physics, the dynamics is complex, and it can be decomposed into a linear and a non-linear part. The former allows the expected performance of the machine to be at reach, whereas the latter might dramatically affect the stability of the circulating beam. While the former can be analysed with the computing power of a laptop, the latter requires BOINC, and hence you! In fact, we perform very large scans of parameter spaces to see how non-linearities affect the motion of beam particles in different regions of the beam phase space and for different values of key machine parameters. Our main observable is the dynamic aperture (DA), i.e. the boundary between stable, i.e. bounded, and unstable, i.e., unbounded, motion of particles.

The studies mainly target the LHC and its upgrade in luminosity, the so-called HL-LHC. Thanks to this new accelerator, by ~2035, the LHC will be able to deliver to experiments x10 more data than what is foreseen in the first 10/15y of operation of LHC in a comparable time. We are in full swing in designing the upgraded machine, and the present operation of the LHC is a unique occasion to benchmark our models and simulation results. The deep knowledge of the DA of the LHC is essential to properly tune the working point of the HL-LHC.

If you have crunched simulations named "workspace1_hl13_collision_scan_*" (Frederik), then you have helped us in mapping the effects of unavoidable magnetic errors expected from the new hardware of the HL-LHC on dynamic aperture, and identify the best working point of the machine and correction strategies. Tasks named like "w2_hllhc10_sqz700_Qinj_chr20_w2*" (Yuri) focus the attention onto the magnets responsible for squeezing the beams before colliding them; due to their prominent role, these magnets, very few in number, have such a big impact on the non-linear dynamics that the knobs controlling the linear part of the machine can offer relevant remedial strategies.

Many recent tasks are aimed at relating the beam lifetime to the dynamic aperture. The beam lifetime is a measured quantity that tells us how long the beams are going to stay in the machine, based on the current rate of losses. A theoretical model relating beam lifetime and dynamic aperture was developed; a large simulation campaign has started, to benchmark the model against plenty of measurements taken with the LHC in the past three years. One set of studies, named "w16_ats2017_b2_qp_0_ats2017_b2_QP_0_IOCT_0" (Pascal), considers as main source of non-linearities the unavoidable multipolar errors of the magnets, whereas tasks named as "LHC_2015*" (Javier) take into account the parasitic encounters nearby the collision points, i.e. the so called "long-range beam-beam effects".

One of our users (Ewen) is carrying out two studies thanks to your help. In 2017 DA was directly measured for the first time in the LHC at top energy, and nonlinear magnets on either side of ATLAS and CMS experiments were used to vary the DA. He wants to see how well the simulated DA compares to these measurements. The second study seeks to look systematically at how the time dependence of DA in simulation depends on the strength of linear transverse coupling, and the way it is generated in the machine. In fact, some previous simulations and measurements at injection energy have indicated that linear coupling between the horizontal and vertical planes can have a large impact on how the dynamic aperture evolves over time.

In all this, your help is fundamental, since you let us carry out the simulations and studies we are interested in, running the tasks we submit to BOINC. Hence, the warmest "thank you" to you all!
Happy crunching to everyone, and stay tuned!

Alessio and Massimo, for the LHC SixTrack team.
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LHC@home down-time due to system updates

LHC@home - Ut, 23.01.2018 - 11:19
Tomorrow Wednesday 24/1, the LHC@home servers will be unavailable for a short period while our storage backend is taken down for a system update.

Today, Tuesday 23/1, some of the Condor servers that handle CMS, LHCb and Theory tasks will be down for a while. Regarding the on-going issues with upload of files, please refer to this thread.

Thanks for your understanding and happy crunching!
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